Which scientist discovered the radioactive element radium?
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1) Benjamin Franklin was a prolific inventor. He invented the lightning rod, the Franklin stove, studied electricity, discovered the Gulf Stream, started the first library, and on and on. Among his many other inventions, what musical instrument did he invent?
2) Who invented Gramophone?
3) What Henry Bessemer invented?
4) For whom high heeled shoes were invented?
5) In which decade was the transistor invented?